William f



(No Model.)

W. F. ROSSMAN.

DRUM FOR HOT AIR FURNAGES.

No. 306,432. Patented Oct. 14, 18814..

WITNESSES; W I/NZTENTOR S ATTORNEY,

lhviTien STaTTs PATENT @rrrcn.

\VILLTAM F. ROSSMAN, OF HUDSON, NElV YORK, ASSIGNOR OF ONE-HALF TO MASON I. CROOKER, OF SAME PLACE.

DRUM FOR HOT-AIR FURNACES.

."JPECJIEICATIOLT forming part of Letters Patent No. 306%32, dated October 1 1-, 1884:.

Application filed November 8, 1W3.

.'0 Mi whom it may concern.-

Be it known that I, WILLIAM F. ROSSMAN, a citizen of the United States of America, residing at Hudson, in the county of Columbia and State of New York, have invented certain new and useful Improvements in Drums for Hot-Air Furnaces, of which the following is a specification, reference being had therein to the accompanying drawings.

This invention relates to an improvement in drums for hot-air furnaces; and it consists in thepeculiar construction, combination, and arrangement of parts hereinafter more fully described, and then pointed out in the claims.

In the accompanying drawings, Figure 1 shows a vertical section of a furnace provided with my drum with the draft fully open, and Fig. 2 shows a similar view with the draft partly shut off and a eoldair passage open.

A represents the outer wall of afurnaee; B, the furnace proper, of any suitable or ordinary construction; 0, the drum, having an opening at D to receive the products of combustion from the furnace B. This drum is provided at its opposite ends with the heads (which may be of cast or sheet iron,) secured by bolts F, passing through the drum. from head to head, and secured by nuts G.

At It is a smoke-pipe, preferably concentric with the drum 0, and passing through the heads at each end of the drum. One end of this smoke-pipe passes to the chimney, (not shown) while the other end has an opening, I, through which the products of combustion pass after giving out most of the heat to the drum.

To regulate the draft in the smokepipe, I use a drmwpipe, .T, which slidesin the smokepipe H, and has an opening, j, through which the smoke, &c., passes, which opening is so constructed that when the draw-pipe J is drawn out to its fullest extent there is but a comparatively small passage between the drum and the pipe H, and there is a passage for the cold air into the pipe, as shown by the arrow in Fig. 2.

In order to prevent the draw-pipe J being withdrawn so as to entirely shut off the draft of the furnace, and to guard against its acci- (No model.)

dental removal, I provide the said d1aw-pipe, on its under side, with a stop, K, which is suitably fastened to the forward part of the pipe, but in such a manner as to have its under surface flush with or in line with the lowest element of the pipe. This construction admits of the stop performingthe functions of supporting the outer end of the pipewhen partially withdrawn, as it extends within the slot j, and of guiding its outer end into the pipe H when it is slid into the Fig. 1.

In operation, when the full draftis wanted, the drawpipe is arranged as shown in Fig. 1; but when it is desired to check the draft the draw-pipeis drawn out, as in Fig. 2, by which means ingress of the smoke is much retarded, and the cold air is thus admitted through the opening), which checks the draft of the fun. nace. Combustion is thus retarded, and yet enough heat is retained in the drum to insure steady draft and temper the cold air, which, being admitted at this opening and required to travel the length of the drum through the inelosed smoke-pipe, becomes heated or tempered so as to preserve sufficient draft, while it checks the fire and avoids all risk of reverting or back draft and emission of coal-gas into the rooms to be warmed. Thus it will be seen that when the draw-pipe is in, as represented in Fig. 1, the draft is open and free through the opening in it into and through the smokepipe to the chimney, and when it is out, as shown in Fig. 2, only a very small portion is left open within the fire-drum, or only sufficient to permit the smoke and gas to pass off into the smoke-pipe. The large portion being open or outside permits the cold air to enter the smokepipe, and thus the draft ofthe stove or furnace can. be checked to any degree re quired by changing the position of the drawpipe without cooling so rapidly or to such an extent as to create a reverse or back draft.

This drum can be used either in a vertical. or horizontal position, and can be made round or oval. One drum may be made to accommoposition shownin date one, two, or more furnaces.

These drums are usually located within the heating-chambers of furnaces, but may be attached to stoves or used independently or simply as heating-drunis. In either case they will be found very economical and useful, as they save much coal, and prevent the back-draft so common in other arrangements.

'I deem it important that the pipe H be inelosed within the drum, that it have a passage connecting with the interior of said drum, and that it pass through the heads at each end thereof, and that the opening I in said pipe, communicating with the drum, be regulated by the pipeJ, for by this means the draft of the furnace is regulated as well as the distance the products of the combustion pass through the said'drum, for as the products'of combustion pass into the opening I as near as possible to their entrance into the drum, the par-' tial drawing out of the pipe J virtually extends the acting surface of the drum, as it compels the products of combustion to pass farther through it before it can escape through the opening in the pipe J.

I am aware that it is not new to construct a stove-pipe with a ventilating-damper at one of its ends, consisting of ashort pipe telescoping in said stove'pipe, and provided with an opening corresponding with that of the vertical flue, and make no claim to such construction as forming a part of my invention, for this is not adapted, as mineis,to lengthen or shorten the passage of the products of combustion through the drum. Moreover, in the construc tion referred to there is no means of guarding against accidental displacement of the damper.

What I claim as new isg 1. The combination, with a drum, of the smoke-pipe H, having an opening, I, drawpipe J, having opening j, and the stop 'K, all combined and operating substantially as and for the purpose specified.

' 2. The combination, with the furnaceB and drum 0, having opening D, heads E E, and bolts F, of the smoke-pipe H, provided with an opening, I, draw-pipe J, having opening j, and the stop K, arranged substantially as and for the purposes set forth.

In combination with the furnace B and drum 0, the pipe H, passing through and supported by said drum, and provided with an opening into said drum, and the pipe J, for regulating the length of said opening, whereby the draft of the furnace is governed and the passage of the products of combustion on their way through the drum lengthened or shortened, as desired, substantially as and for the purpose specified.

In testimony whereof I affix my signature in presence of two witnesses.

\VM. F. ROSSMAN. Witnesses:

O. W. Bos'rwIoK, MARY E. Bosrwron. 

